Table 4 Judgment matrix.

From: Quantitative classification evaluation model for tight sandstone reservoirs based on machine learning

Element

Pd (MPa)

K (10–3 µm2)

P50 (MPa)

Dr

SP

R50 (µm)

Φ (%)

Pd (MPa)

1

1/3

1/3

1/3

1/3

1/5

1/5

K (10–3 µm2)

3

1

1/3

1/3

1/3

1/3

1/3

P50 (MPa)

3

3

1

1/3

1/3

1/3

1/3

Dr

3

3

3

1

1/3

1/3

1/3

SP

3

3

3

3

1

1/3

1/3

R50 (µm)

5

3

3

3

3

1

1/3

Φ (%)

5

3

3

3

3

3

1

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